Steam-generating tube



(No Model.)

A. 'E. FRANCIS.

Patented May 16, 1882. M

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' UNITED STATES PATENT OFFICE.

ALLAN E. FRANCIS, OF CLEVELAND, OHIO.

STEAM-GENERATING TUBE.

SPECIFICATION forming part of Letters Patent No. 257,931, dated May 16, 1882.

' Application tiled July 30, 1881. (N0 model.)

To all whom it may concern:

Be it known that I, ALLAN E. FRANCIS, of Cleveland, in the county of Onyahoga and State of Ohio, have invented a new and useful Improvement in Steam-Generating Tubes,

which improvement is fully set forth in the following specification, reference beinghad to the accompanying drawing.

The object of my invention is to instantaneouslyconvert water into steam for purposes ofmot-ive power and steam-heating, in such a manneras to economize fuel and space and obviatethe existing danger attending the use of steam, by dispensing with a boiler.

To attain this have constructed a massive iron steam-tube, A, (shown on the drawing in longitudinal section,) with itsinternal diameter much greater at one end than at the other, the small internal diameter being the size of the stream of water it is calculated thegeneratingtube can receive without chilling. The large internal diameter at the other end must be suflicient to allow a free escape for the steam which'passes between the inner walls of this tube andthe iron core (J, which is of a form corresponding to the enlarged inner portion of thetube A, but smaller, and is secured.

within the same by small projecting points of contact (1 d d d, leaving a steam-space entirely around and at the ends of the core. The large end of'tube A is closed with a cap, B,p'rorider]; with steam-exit E .or, it more than one.

is used, they are to be connected with a steamchamber.

In use this generating-tube is placed in a fire and heated to redness. The wateris forced into the tube at T, and, if the tube is quite red, will assume a spheroidal state, and in this condition much would pass out with the steam were it not that the temperature of the core when in use is below a red heatand instantly converts the water into steam by contact. The steam thus generated is also superheated, and

a large per cent. of the heat from the fuel is utilized.

I claim as my invention- TubeAand coreU,combined andeonstructed substantially as shown, the tube A having its ALLAN E. FBANGIS Witnesses:

M. M. FRANCIS, JENNY L. FRANcIs. 

